From patchwork Thu May 16 13:04:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Louis Chauvet X-Patchwork-Id: 13666184 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4A23DC25B74 for ; Thu, 16 May 2024 13:05:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6158910ED02; Thu, 16 May 2024 13:05:32 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=bootlin.com header.i=@bootlin.com header.b="gVZaYWo7"; dkim-atps=neutral Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1AEA810ED0B for ; Thu, 16 May 2024 13:05:30 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 2F4A7C0003; Thu, 16 May 2024 13:05:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1715864729; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2CGHYclRUATEtz6nTI4ILUcfiZlmoTjHWGWX9MIfVmI=; b=gVZaYWo7x3keNpiYEvidUD/3Sn6r5/zAqC1Zt2DiG8+WnAsZDtsIhucZ0gXa7jPkScy1IA V1savOZL/fmKSNU3xs64G9gmfMM4rcqUM4ZNPE7MshbeSMgwh/duYA5SdtMyPeKwvtUom+ ufqi8OQ7Vp77tZuo9T5TctsAAFb2YY8D/uzWQglBkHlCo1grkYNikXeIF/b7ypVv5ghcfk O7W0vT5gtpNXrL3K1fJkF5FiDOWyeV1gGVhjZH75QHJYKnQZHzRHKOJVLrFIXNWgc8etqB 8U38Cn87qc4zFcGbywTl43Vn8BQt2vGturLewCfQnaG1udRduFGqr3tg4sxOoA== From: Louis Chauvet Date: Thu, 16 May 2024 15:04:54 +0200 Subject: [PATCH v8 09/17] drm/vkms: Introduce pixel_read_direction enum MIME-Version: 1.0 Message-Id: <20240516-yuv-v8-9-cf8d6f86430e@bootlin.com> References: <20240516-yuv-v8-0-cf8d6f86430e@bootlin.com> In-Reply-To: <20240516-yuv-v8-0-cf8d6f86430e@bootlin.com> To: Rodrigo Siqueira , Melissa Wen , =?utf-8?q?Ma=C3=ADra_Canal?= , Haneen Mohammed , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , rdunlap@infradead.org, arthurgrillo@riseup.net, Jonathan Corbet , pekka.paalanen@haloniitty.fi Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, jeremie.dautheribes@bootlin.com, miquel.raynal@bootlin.com, thomas.petazzoni@bootlin.com, seanpaul@google.com, marcheu@google.com, nicolejadeyee@google.com, Louis Chauvet X-Mailer: b4 0.14-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=5177; i=louis.chauvet@bootlin.com; h=from:subject:message-id; bh=Xka9lszlPd+b3dwumLg+7lvQxk/Cdt0OW/yXGQoV0gc=; b=owEBbQKS/ZANAwAIASCtLsZbECziAcsmYgBmRgSBejNKB+CWCxnruCb7sdfLNgK4afvXnBlOk 35I0ZEZabaJAjMEAAEIAB0WIQRPj7g/vng8MQxQWQQgrS7GWxAs4gUCZkYEgQAKCRAgrS7GWxAs 4phAD/4tXYctKQoO7usKVa0nDc0/jAyNEGaM0ygDJmC2hB8DIw60lX+7zMmy8RoPDdsWyfrZboL 4mX/pUUl/hipLHbqM2o8Y9ESPI64Mbz8mpvhE4aP2oUIld/AihTX+rdjx4rG7TtZX/KvFAgNjR6 dIHsK2Nl9ADokGd9ibpS9AuVQTENRabIuHC9tjr8M/NdlFsQmN/14WEIyx/B1yIoR3Wx9zcvRhH E3PJFbwTNN/8wSeuJxb3rjObpthUbS1kJwkbRe1h4ofoSO5TJieg/rMiR4NJpsYOBYZGFQj6Gyk tvJTr7XPV8t4khVD2RZJBvQeB/kaPs5aS6779ZPbDhlOgzauGoYr37LMGzX8Xemi04fOSBj1hbP KLrvy8SFfZnSEKUIPdZjdCK0JPMY6IrKTy3fRyb/EXpc2Ln697Ro7cKxaWJWSL69XqQdiLdgO0r wol6Hbe0KzsFdZF2eqXduxoi7CCA6I78glNRmO8uGCjSSr/h4Vo89bS1kCGuRuFbiyLoKKuOe4s WTJFhl1rgZ1IdYEXI7tG+6WcHTGUAOdEZxaZFLovhwuuZ4M8UxgCY/NWEJyTpUy/NW4mYPCGiuz dCUsqRIJ3F0+NYnhHw5ES1zeEgTWfrRF7WCC/Nw/qjMGpKI8nxl5tfiplkRol9NnjQRcepBmuWt 6kAyG7CZ4uHOzwA== X-Developer-Key: i=louis.chauvet@bootlin.com; a=openpgp; fpr=8B7104AE9A272D6693F527F2EC1883F55E0B40A5 X-GND-Sasl: louis.chauvet@bootlin.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The pixel_read_direction enum is useful to describe the reading direction in a plane. It avoids using the rotation property of DRM, which not practical to know the direction of reading. This patch also introduce two helpers, one to compute the pixel_read_direction from the DRM rotation property, and one to compute the step, in byte, between two successive pixel in a specific direction. Signed-off-by: Louis Chauvet --- drivers/gpu/drm/vkms/vkms_composer.c | 46 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/vkms/vkms_drv.h | 11 +++++++++ drivers/gpu/drm/vkms/vkms_formats.c | 32 +++++++++++++++++++++++++ 3 files changed, 89 insertions(+) diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c index 45b111c74884..fb4967a00398 100644 --- a/drivers/gpu/drm/vkms/vkms_composer.c +++ b/drivers/gpu/drm/vkms/vkms_composer.c @@ -159,6 +159,52 @@ static void apply_lut(const struct vkms_crtc_state *crtc_state, struct line_buff } } +/** + * direction_for_rotation() - Get the correct reading direction for a given rotation + * + * @rotation: Rotation to analyze. It correspond the field @frame_info.rotation. + * + * This function will use the @rotation setting of a source plane to compute the reading + * direction in this plane which correspond to a "left to right writing" in the CRTC. + * For example, if the buffer is reflected on X axis, the pixel must be read from right to left + * to be written from left to right on the CRTC. + */ +static enum pixel_read_direction direction_for_rotation(unsigned int rotation) +{ + struct drm_rect tmp_a, tmp_b; + int x, y; + + /* + + * Points A and B are depicted as zero-size rectangles on the CRTC. + * The CRTC writing direction is from A to B. The plane reading direction + * is discovered by inverse-transforming A and B. + * The reading direction is computed by rotating the vector AB (top-left to top-right) in a + * 1x1 square. + */ + + tmp_a = DRM_RECT_INIT(0, 0, 0, 0); + tmp_b = DRM_RECT_INIT(1, 0, 0, 0); + drm_rect_rotate_inv(&tmp_a, 1, 1, rotation); + drm_rect_rotate_inv(&tmp_b, 1, 1, rotation); + + x = tmp_b.x1 - tmp_a.x1; + y = tmp_b.y1 - tmp_a.y1; + + if (x == 1 && y == 0) + return READ_LEFT_TO_RIGHT; + else if (x == -1 && y == 0) + return READ_RIGHT_TO_LEFT; + else if (y == 1 && x == 0) + return READ_TOP_TO_BOTTOM; + else if (y == -1 && x == 0) + return READ_BOTTOM_TO_TOP; + + + WARN_ONCE(true, "The inverse of the rotation gives an incorrect direction."); + return READ_LEFT_TO_RIGHT; +} + /** * blend - blend the pixels from all planes and compute crc * @wb: The writeback frame buffer metadata diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h index 17081effe99a..5d0e87fe50c0 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.h +++ b/drivers/gpu/drm/vkms/vkms_drv.h @@ -69,6 +69,17 @@ struct vkms_writeback_job { pixel_write_t pixel_write; }; +/** + * enum pixel_read_direction - Enum used internaly by VKMS to represent a reading direction in a + * plane. + */ +enum pixel_read_direction { + READ_BOTTOM_TO_TOP, + READ_TOP_TO_BOTTOM, + READ_RIGHT_TO_LEFT, + READ_LEFT_TO_RIGHT +}; + /** * typedef pixel_read_t - These functions are used to read a pixel in the source frame, * convert it to `struct pixel_argb_u16` and write it to @out_pixel. diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c index 3874c8fe4f84..09883550b4aa 100644 --- a/drivers/gpu/drm/vkms/vkms_formats.c +++ b/drivers/gpu/drm/vkms/vkms_formats.c @@ -77,6 +77,38 @@ static void packed_pixels_addr(const struct vkms_frame_info *frame_info, *addr = (u8 *)frame_info->map[0].vaddr + offset; } +/** + * get_block_step_bytes() - Common helper to compute the correct step value between each pixel block + * to read in a certain direction. + * + * @fb: Framebuffer to iter on + * @direction: Direction of the reading + * @plane_index: Plane to get the step from + * + * As the returned count is the number of bytes between two consecutive blocks in a direction, + * the caller may have to read multiple pixels before using the next one (for example, to read from + * left to right in a DRM_FORMAT_R1 plane, each block contains 8 pixels, so the step must be used + * only every 8 pixels). + */ +static int get_block_step_bytes(struct drm_framebuffer *fb, enum pixel_read_direction direction, + int plane_index) +{ + switch (direction) { + case READ_LEFT_TO_RIGHT: + return fb->format->char_per_block[plane_index]; + case READ_RIGHT_TO_LEFT: + return -fb->format->char_per_block[plane_index]; + case READ_TOP_TO_BOTTOM: + return (int)fb->pitches[plane_index] * drm_format_info_block_width(fb->format, + plane_index); + case READ_BOTTOM_TO_TOP: + return -(int)fb->pitches[plane_index] * drm_format_info_block_width(fb->format, + plane_index); + } + + return 0; +} + /** * packed_pixels_addr_1x1() - Get the pointer to the block containing the pixel at the given * coordinates